Crimestoppers stumped up the bounty amid fears witnesses are too afraid to come forward because of the victim’s criminal links.

Monaghan, 35, survived being shot in the shoulder by the armed maniac disguised in woollies on Monday January 16.

Angela Parker, national manager of Crimestoppers in Scotland, said: “It’s shocking to think that this attempted murder happened right in front of a busy primary school in broad daylight at the start of the school day.

“The parents of the school and the nearby Penilee estate have a right to feel safe, especially when they are dropping of children in front of the school gates.

“We are now offering a substantial reward for information given to Crimestoppers and urge local people or anyone who is in the know to please pick up the phone or log on to our website and pass on information in complete anonymity.”

Police confirmed it was “likely” the gunman used a getaway car and have urged any witnesses to come forward.

We told last week how Monaghan faces a cop quiz at his Spanish bolthole.